And now, to the latest of an emergency landing in Tampa, Florida, after reports of smoke in the cockpit. David Kerley has the latest right now. He joins us live. Good morning, David. Reporter: Good morning, Amy. This is a flight from north-to-south Florida. But the pilot had to put this down as quickly as possible, in the middle of the state, in Tampa. I was physically taken extremely emotional. Thinking this was the end, end, end of the road. Reporter: Overnight, panicked passengers describing what they called a traumatic energy landing. I heard behind me, the very loud explosion. And smoke came in a little bit from the bottom. And people started screaming. Reporter: American airlines envoy flight 3454, with 50 people onboard, was an evening flight from Tallahassee to Miami, when passengers say they heard a loud boom. In the cockpit, the pilot reported smoke. Request permission to go to our standby locations for incoming energy on runway 1 left. Reporter: You can hear the alarm bells as he's asking for the emergency landing. Envoy 3454 Tampa approach, descend and maintain 5,000. Okay. I got 50 souls onboard. And fuel is standby. Two hours of fuel onboard. Reporter: On the flight, congressman and the superintendent of miami-dade county schools. He tweeted this selfie. But said the experience was no laughing matter. We descended quickly. And we proceeded through the instructions. You know, brace yourselves and put your head between your legs. You didn't know that the plane was going to explode. Reporter: The plane was met by emergency vehicles on the ground. Some passengers were hyperventilating. One girl with asthma treated at the scene. We're told by passengers in a they had to get on and off this plane twice because of maintenance problems, a couple hours' delay. American airlines tells us that's not related to what happened. And the airline would not confirm there was an explosion on the aircraft.

This transcript has been automatically generated and may not be 100% accurate.

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